Add three USB (Universal Serial Bus)-A ports & one USB (Universal Serial Bus)-C port, via two host controllers, through a standard PCI Express slot. This USB (Universal Serial Bus) 3.1 PCIe card lets you add three USB (Universal Serial Bus) Type-A ports & one USB (Universal Serial Bus) Type-C port to your computer, through a PCI Express slot. It makes it easy to upgrade your PC to the faster speed of USB (Universal Serial Bus) 3.1 (10 Gbps) so that you can access newer peripherals at twice the speed of traditional USB (Universal Serial Bus) 3.0 (5 Gbps) cards. When multiple devices are connected, traditional single-bus USB (Universal Serial Bus) cards share the maximum bandwidth between all ports. By employing two host controller chipsets, shared across two ports rather than four, this 4-port PCIe to USB (Universal Serial Bus) 3.1 card dedicates up to 10 Gbps for each set of two USB (Universal Serial Bus) ports. It reduces performance bottlenecks & doubles your total available bandwidth to 20 Gbps. With higher data throughput support, the card is ideal for external hard drives, hard drive enclosures, & large external storage devices. It lets you access multiple devices simultaneously for read & write access. The 4-port USB (Universal Serial Bus) 3.1controller card adds dual independent channels to your computer & shares 10 Gbps of bandwidth between two USB (Universal Serial Bus) ports. Each set of two ports shares a combined bandwidth of 10 Gbps. If a single device is accessing the channel, the card will provide data transfer rates of up to 10 Gbps to the device. If two devices are accessing the channel simultaneously, the 10 Gbps of bandwidth will be shared between both devices.